| 2018-08-22 23:43:24 |
Ryan Finnie |
bug |
|
|
added bug |
| 2018-08-22 23:45:55 |
William Grant |
bug |
|
|
added subscriber William Grant |
| 2018-08-22 23:48:26 |
Haw Loeung |
bug |
|
|
added subscriber The Canonical Sysadmins |
| 2018-08-23 00:28:45 |
Dean Henrichsmeyer |
landscape-client: importance |
Undecided |
High |
|
| 2018-08-23 07:24:10 |
Adam Collard |
bug |
|
|
added subscriber Adam Collard |
| 2018-08-23 07:24:13 |
Adam Collard |
tags |
|
is |
|
| 2018-08-23 16:19:41 |
Joel Sing |
bug |
|
|
added subscriber Joel Sing |
| 2018-10-31 14:29:29 |
Adam Collard |
bug task added |
|
ubuntu |
|
| 2018-10-31 14:29:34 |
Adam Collard |
bug task deleted |
ubuntu |
|
|
| 2018-10-31 14:29:48 |
Adam Collard |
landscape-client: status |
New |
Triaged |
|
| 2018-11-01 23:49:00 |
Ryan Finnie |
attachment added |
|
lp1788518-10percent-spread.patch https://bugs.launchpad.net/landscape-client/+bug/1788518/+attachment/5208028/+files/lp1788518-10percent-spread.patch |
|
| 2019-02-13 15:04:38 |
Simon Poirier |
landscape-client: assignee |
|
Simon Poirier (simpoir) |
|
| 2019-02-13 15:04:40 |
Simon Poirier |
landscape-client: status |
Triaged |
In Progress |
|
| 2019-03-06 06:31:03 |
Junien F |
bug |
|
|
added subscriber Junien Fridrick |
| 2019-03-06 06:32:09 |
Barry Price |
bug |
|
|
added subscriber Barry Price |
| 2019-03-26 14:59:28 |
Simon Poirier |
landscape-client: status |
In Progress |
Fix Committed |
|
| 2019-06-17 23:03:12 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~simpoir/ubuntu/+source/landscape-client/+git/landscape-client/+merge/368945 |
|
| 2019-06-18 23:08:12 |
Simon Poirier |
description |
The various intervals appear to be statically determined from program start. As a practical example, a rebooted VM host with a large number of guests means all the guests start landscape-client at about the same time. Then every 30 minutes, package-monitor runs (which is a rather heavy operation). Multiply by a hundred or so and you've got a large flood on the host.
When the client starts up, it would be good to have the initial schedule for each timer be ((interval / 2) + random(interval)), so the collective load is spread out over the entire interval. |
[Impact]
* Restarting hosts/clouds of multiple VMs or containers managed by
landscape leads to synchronized monitoring tasks. This can generate
significant recurring load.
* The fix adds a configurable randomized interval to scheduled tasks.
[Test Case]
sudo landscape-config --stagger-launch 0.5 --log-level debug
# accept client in server interface
sudo tail -f /var/log/landscape/monitor.log
# Check for debug log entries mentioning monitors getting delayed
[Regression Potential]
* Although changing the scheduler for non-fixed loop intervals could
have been slightly better at avoid load peaks on shared hosts, the
current approach has been deemed safer as it simply adds an initial
delay to tasks. The current logic of scheduling is unchanged.
* External scripts expecting monitors to run instantly on
landscape-client restart could be affected. I'm not aware of
any such case, as the async nature of the code never made that
guarantee.
* The stagger interval is configurable with a flag and a configuration
entry to work around regressions.
[Original Description]
The various intervals appear to be statically determined from program start. As a practical example, a rebooted VM host with a large number of guests means all the guests start landscape-client at about the same time. Then every 30 minutes, package-monitor runs (which is a rather heavy operation). Multiply by a hundred or so and you've got a large flood on the host.
When the client starts up, it would be good to have the initial schedule for each timer be ((interval / 2) + random(interval)), so the collective load is spread out over the entire interval. |
|
| 2019-06-28 13:28:09 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~simpoir/ubuntu/+source/landscape-client/+git/landscape-client/+merge/369449 |
|
| 2019-06-28 17:33:40 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~simpoir/ubuntu/+source/landscape-client/+git/landscape-client/+merge/369457 |
|
| 2019-06-28 17:34:09 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~simpoir/ubuntu/+source/landscape-client/+git/landscape-client/+merge/369458 |
|
| 2019-07-09 16:37:33 |
Brian Murray |
bug task added |
|
landscape-client (Ubuntu) |
|
| 2019-07-09 16:37:43 |
Brian Murray |
landscape-client (Ubuntu): status |
New |
Fix Released |
|
| 2019-07-09 16:42:54 |
Brian Murray |
landscape-client (Ubuntu Disco): status |
New |
Fix Committed |
|
| 2019-07-09 16:42:56 |
Brian Murray |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2019-07-09 16:42:58 |
Brian Murray |
bug |
|
|
added subscriber SRU Verification |
| 2019-07-09 16:43:05 |
Brian Murray |
tags |
is |
is verification-needed verification-needed-disco |
|
| 2019-07-09 16:53:02 |
Adam Collard |
removed subscriber Adam Collard |
|
|
|
| 2019-07-12 20:29:57 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~simpoir/ubuntu/+source/landscape-client/+git/landscape-client/+merge/370075 |
|
| 2019-07-19 18:52:59 |
Brian Murray |
landscape-client (Ubuntu Bionic): status |
New |
Fix Committed |
|
| 2019-07-19 18:53:06 |
Brian Murray |
tags |
is verification-needed verification-needed-disco |
is verification-needed verification-needed-bionic verification-needed-disco |
|
| 2019-07-25 23:14:00 |
Simon Poirier |
tags |
is verification-needed verification-needed-bionic verification-needed-disco |
is verification-done-bionic verification-done-disco verification-needed |
|
| 2019-08-13 20:24:25 |
Brian Murray |
landscape-client (Ubuntu Xenial): status |
New |
Fix Committed |
|
| 2019-08-13 20:24:34 |
Brian Murray |
tags |
is verification-done-bionic verification-done-disco verification-needed |
is verification-done-bionic verification-done-disco verification-needed verification-needed-xenial |
|
| 2019-09-05 21:04:04 |
Simon Poirier |
tags |
is verification-done-bionic verification-done-disco verification-needed verification-needed-xenial |
is verification-done verification-done-bionic verification-done-disco verification-done-xenial |
|
| 2019-09-09 09:25:30 |
Łukasz Zemczak |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2019-09-09 09:28:04 |
Launchpad Janitor |
landscape-client (Ubuntu Bionic): status |
Fix Committed |
Fix Released |
|
| 2019-09-09 09:35:28 |
Launchpad Janitor |
landscape-client (Ubuntu Disco): status |
Fix Committed |
Fix Released |
|
| 2019-11-13 00:08:20 |
Launchpad Janitor |
landscape-client (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
| 2021-11-19 18:40:46 |
Ryan Finnie |
removed subscriber Ryan Finnie |
|
|
|
